Examples of java.net.URLConnection

java.net.URLConnection
etf.org/rfc/rfc2068.txt">http://www.ietf.org/rfc/rfc2068.txt Note about fileNameMap: In versions prior to JDK 1.1.6, field fileNameMap of URLConnection was public. In JDK 1.1.6 and later, fileNameMap is private; accessor and mutator methods {@link #getFileNameMap() getFileNameMap} and {@link #setFileNameMap(java.net.FileNameMap) setFileNameMap} are addedto access it. This change is also described on the Compatibility page. Invoking the close() methods on the InputStream or OutputStream of an URLConnection after a request may free network resources associated with this instance, unless particular protocol specifications specify different behaviours for it. @author James Gosling @version 1.106, 06/28/06 @see java.net.URL#openConnection() @see java.net.URLConnection#connect() @see java.net.URLConnection#getContent() @see java.net.URLConnection#getContentEncoding() @see java.net.URLConnection#getContentLength() @see java.net.URLConnection#getContentType() @see java.net.URLConnection#getDate() @see java.net.URLConnection#getExpiration() @see java.net.URLConnection#getHeaderField(int) @see java.net.URLConnection#getHeaderField(java.lang.String) @see java.net.URLConnection#getInputStream() @see java.net.URLConnection#getLastModified() @see java.net.URLConnection#getOutputStream() @see java.net.URLConnection#setAllowUserInteraction(boolean) @see java.net.URLConnection#setDefaultUseCaches(boolean) @see java.net.URLConnection#setDoInput(boolean) @see java.net.URLConnection#setDoOutput(boolean) @see java.net.URLConnection#setIfModifiedSince(long) @see java.net.URLConnection#setRequestProperty(java.lang.String,java.lang.String) @see java.net.URLConnection#setUseCaches(boolean) @since JDK1.0

    filesLastModified = new HashMap<String, Long>();


    // store file sizes and mark which files not to download
    fileSizes = new int[urlList.length];


    URLConnection urlconnection;


    File cacheFile = new File(dir, "cache");


    // if cache file exists, load it
    if (cacheFile.exists()) {
      filesLastModified = readCacheFile(cacheFile);
    }


    // calculate total size of jars to download
    for (int i = 0; i < urlList.length; i++) {
      urlconnection = urlList[i].openConnection();
      urlconnection.setDefaultUseCaches(false);
      if (urlconnection instanceof HttpURLConnection) {
        ((HttpURLConnection) urlconnection).setRequestMethod("HEAD");
      }


      fileSizes[i] = urlconnection.getContentLength();


      long lastModified = urlconnection.getLastModified();
      String fileName = getFileName(urlList[i]);




      if (cacheEnabled && lastModified != 0 &&
          filesLastModified.containsKey(fileName)) {

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   */
  protected void downloadJars(String path) throws Exception {


    setState(STATE_DOWNLOADING);


    URLConnection urlconnection;


    int initialPercentage = percentage = 15;


    // download each jar
    byte buffer[] = new byte[65536];
    for (int i = 0; i < urlList.length; i++) {


      // skip file if marked as -2 (already downloaded and not changed)
      if (fileSizes[i] == -2) continue;


      int unsuccessfulAttempts = 0;
      int maxUnsuccessfulAttempts = 3;
      boolean downloadFile = true;


      // download the jar a max of 3 times
      while(downloadFile) {
        downloadFile = false;


        debug_sleep(2000);


        urlconnection = urlList[i].openConnection();


        if (urlconnection instanceof HttpURLConnection) {
          urlconnection.setRequestProperty("Cache-Control", "no-cache");
          urlconnection.connect();
            }


        String currentFile = getFileName(urlList[i]);
        InputStream inputstream = getJarInputStream(currentFile, urlconnection);
        FileOutputStream fos = new FileOutputStream(path + currentFile);

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        // fallback to something else
      
      try{
        URL  url = new URL( "http://www.google.com/" );
        
        URLConnection connection = url.openConnection();
        
        connection.setConnectTimeout( 10000 );
        
        connection.connect();
        
        return( null );
        
      }catch( Throwable f ){

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              }
            }else{
              
              URL source_url = new URL( url_str );
            
              URLConnection connection = source_url.openConnection();
              
              is = source_url.openConnection().getInputStream();
              
              String s = connection.getHeaderField( "content-length" );
              
              if ( s != null ){
                
                length = Long.parseLong( s );

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            xqdoc = _sharedCache.get(docurl);
        } else {
            final InputStream is;
            boolean parseAsHtml = false;
            try {
                final URLConnection conn = docurl.openConnection();
                // TODO REVIEWME workaround code                
                final String contentType = conn.getContentType();
                if(unescaped.endsWith(".html")
                        || (contentType != null && contentType.contains("html"))) {
                    parseAsHtml = true;
                    try {
                        conn.setRequestProperty("User-agent", "Mozilla/5.0");
                    } catch (IllegalStateException ace) {// already connected                        
                        ;
                    }
                }
                is = conn.getInputStream();
            } catch (IOException e) {
                throw new DynamicError("Openning a document failed: " + unescaped, e);
            }
            final boolean resolveEntity = unescaped.startsWith("http");
            final DocumentTableModel dtm = new DocumentTableModel(parseAsHtml, resolveEntity);

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     */
    public org.omg.CORBA.Object readIOR(URL iorURL) throws IOException {
        org.omg.CORBA.Object object = null;


        if (iorURL != null) {
            URLConnection urlConnection = iorURL.openConnection();
            InputStream is = urlConnection.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader reader = new BufferedReader(isr);
            String ior = reader.readLine();


            if (Debug.debugging("corba")) {

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            {
                lastModified = file.lastModified();
            }
            else
            {
                URLConnection uriConnection = resource.openConnection();
                lastModified = uriConnection.getLastModified();


                // - we need to set the urlConnection to null and explicity
                //   call garbage collection, otherwise the JVM won't let go
                //   of the URL resource
                uriConnection = null;

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    }


    public void shutdown() {
        if (url != null) {
            try {
                URLConnection connect = url.openConnection();
                if (connect instanceof HttpURLConnection) {
                    ((HttpURLConnection)connect).disconnect();
                }
            } catch (IOException ex) {
                //ignore

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                        }
                    }


                } else {


                    URLConnection uc = repositoryURL.openConnection();
                    if (uc instanceof JarURLConnection){
                        JarFile  jarFile = ((JarURLConnection)uc).getJarFile();


                        // get all jar entries that belongs to the help repository
                        Set jarEntries = getJarDirectoryEntries(jarFile, ((JarURLConnection) uc).getEntryName());

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                e.printStackTrace();
            }
            
        } else if (responseObj instanceof URLConnection) {
            try {
                URLConnection connection = (URLConnection)responseObj;
                connection.getOutputStream().close();
                connection.getInputStream().close();
            } catch (IOException ioe) {
                LOG.log(Level.WARNING, "DECOUPLED_RESPONSE_FAILED_MSG", ioe);
            }
        }

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